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Answer Wiki. The ionic charge of oxygen is -2. You can tell because oxygen is in group number 6, so it has 6 valence electrons. Since it needs 2 more electrons to become neutral with a full outer shell of 8 electrons, its charge is -2 (since adding electrons gives a negative charge).
Best Answer: All atoms are neutral. An oxygen atom is neutral. The oxygen molecule, O2 is neutral. The oxygen ion has taken on 2 additional electrons from another atom to become the O^-2 ion. Oxygen, from column 6 has 8 electrons, 2 in the first energy level[now that level is full] and 6 in the outer energy level.